VCE Methods Question Thread!

[BLACKCATT]

In short, a dilation from the y axis is where the x coordinates of the graph change. When we say, "dilation by a factor of 2 from the y axis" we would 'stretch' the graph by multiplying all the x coordinates by 2. So when we transform a function through a dilation from the y axis, we use f(1/k) where k is the dilation factor.

Your example is right and so you're multiplying the x coordinates by 2 not 1/2, it's only for the sake of the function that the dilation appears as 1/2. So for your question, a dilation from the y axis by 'm' will result in the x coordinates being multiplied by m not 1/m.

That clears it up, thank you so much

[BLACKCATT]

Hahah, serious? Don't remember it at all... Granted, I also don't remember the exam 2 being difficult because exam 1 was the crap one, and everybody keeps telling me otherwise, so.

pretty sure exam 2 was the murderer , 2013 exam 1 was easier than some of the previous (at least for me)

[G3B]

Hi guys
I'm having some trouble with time management in the tech active exam. I tend not to have enough time to check all my answers /rush my checking so I change a right answer. Any suggestions for improvement?

[keltingmeith]

pretty sure exam 2 was the murderer , 2013 exam 1 was easier than some of the previous (at least for me)

Really? I thought it was cray cray... I mean, I could do it all, but I did not expect any of the stuff on there from a methods exam. Threw me a bit during reading time, made me glad I had another 10 minutes to bring myself to before I could actually answer.

[psyxwar]

Am i the only one who found VCAA 2012 harder than VCAA 2013? O__O

[keltingmeith]

Am i the only one who found VCAA 2012 harder than VCAA 2013? O__O

Yes. I would've much preferred 2012 to 2013 (did smash out 2012 the day before my exams, I literally said, "if tomorrow is as nice as this exam just was, I'll be fine")

[Zealous]

Really? I thought it was cray cray... I mean, I could do it all, but I did not expect any of the stuff on there from a methods exam. Threw me a bit during reading time, made me glad I had another 10 minutes to bring myself to before I could actually answer.

I'm with you on this one. I somehow found exam 1 harder than exam 2 last year also. Lost more marks on exam 1 than on exam 2 last year... My algebra skills by hand are not the strongest and the numbers were messy to work with.

I think the hardest thing in 2012 exam 2 was the Tasmania Jones related rates? I personally think overall it was less challenging than 2013 exam 2.

[soNasty]

i have this function yeah


and its asking me to 'Show that the equation of the tangent at the point (c,0) is equal to: -1/2(x-16a^2)'
how would I calculate the gradient of the tangent to be -1/2? All I'm getting are annoying abs values of a. The answers tell me to get rid of the abs value since a>0, but could someone tell me why/how? thanks

[soNasty]

oooooooohhhhhhhhhhhh, ok. thanks zezima!
i know bad.. insight 2014 is a bitch

[Blondie21]

how do I do part b lmaoo

[Reus]

This is going to be the stupidest question, but for pre req's say for methods = 25. Is this a 25 raw or scaled lol 

[IndefatigableLover]

Question 20 (MCQ) in Exam 2 for VCAA 2010.. could someone go through the explanation in how they got the right answer please?

http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2010mmcas2-w.pdf
http://www.vcaa.vic.edu.au/Documents/exams/mathematics/mm2_assessrep_10.pdf

[Blondie21]

This is going to be the stupidest question, but for pre req's say for methods = 25. Is this a 25 raw or scaled lol 

raw :p

[Reus]

raw :p

Well I'm screwed LOL

[psyxwar]

Question 20 (MCQ) in Exam 2 for VCAA 2010.. could someone go through the explanation in how they got the right answer please?

http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2010mmcas2-w.pdf
http://www.vcaa.vic.edu.au/Documents/exams/mathematics/mm2_assessrep_10.pdf

Integral can be split into

Second integral is trivial to evaluate, so I'll focus on the first one.

What is our new function relative to f(x)? Well, it's a dilation by 5 from the y-axis, right? This means that (x,y) -> (5x,y).

Thus, we change the terminals from x->5x. So now our terminals are 0 and 5a for the translated graph instead of 0 and a. But since our new graph is dilated by a factor of 5 from the y axis, it is being stretched by that much.


Thus,